#nullable enable

#region
var _input = Array.Empty<string>();
var _iter = 0;
string String()
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return _input[_iter++];
}
T I<T>() where T : IParsable<T> => T.Parse(String(), null);
#endregion

T[] Range<T>(int n, Func<T> F) => Enumerable.Range(0, n).Select(_ => F()).ToArray();
string Join<T>(IEnumerable<T> values, bool ws = false) => string.Join(ws ? " " : Environment.NewLine, values);

var sqrts = new Dictionary<long, long>();
for (var i = 1L; i <= 1000000; i++)
{
    var s = (i * i).ToString().Where(c => c != '0').Order().ToArray();
    var sn = long.Parse(new string(s));
    if (!sqrts.ContainsKey(sn)) sqrts[sn] = i;
}
var t = I<int>();
var ans = new long[t];
ans.AsSpan().Fill(-1);
for (var i = 0; i < t; i++)
{
    var ns = String().Where(c => c != '0').Order().ToArray();
    var n = long.Parse(new string(ns));
    if (sqrts.TryGetValue(n, out var v)) ans[i] = v * v;
}
Console.WriteLine(Join(ans));